| 摘要 |
PROBLEM TO BE SOLVED: To generate a supply voltage controlled stably by an input voltage even when an AC frequency of an output load current is higher than a self-excited oscillation frequency.SOLUTION: A power circuit includes a main amplifier 211, a sub amplifier 221, a switching regulator 230 and a current control circuit 222. The main amplifier 211 amplifies an input signal Venv to output a first amplified signal to a power terminal 240. The sub amplifier 221 amplifies the input signal Venv to output a second amplified signal. The switching regulator 230 supplies a current generated by a switching action based on the first amplified signal to the power terminal 240. The current control circuit 222 controls currents flowing through a first path 251 and a second path 252 branching from the power terminal 240, respectively, on the basis of the second amplified signal to control a supply voltage supplied out from the power terminal 240. |
